一.TransactionScope 环境事务 static async Task TransactionScopeAsync() { using (var scope = new TransactionScope(TransactionScopeAsyncFlowOption.Enabled)) { Transaction.Current.TransactionCompleted += OnTransactionCompleted; Utilities.DisplayTransactionIn…

在DependentTransaction()方法中,实例化CommittableTransaction类,创建一个根事务,显示事务的信息.接着, tx.DependentClone()方法创建一个依赖的事务.把这个依赖事务传递给TxTask()方法,它定义为新任务的入口. static void DependentTransaction() { var tx = new CommittableTransaction(); Utilities.DisplayTransactionInformat…

14.3.2 InnoDB Transaction Model InnoDB 事务模型 14.3.2.1 Transaction Isolation Levels 事务隔离级别 14.3.2.2 autocommit, Commit, and Rollback 14.3.2.3 Consistent Nonlocking Reads 一直非堵塞读 14.3.2.4 Locking Reads 锁定读 在 InnoDB 事务模型里, 目的是结合一个多版本数据库具有2阶段锁定的最好的特性的结合 In…

from django.shortcuts import renderfrom django.http import HttpResponsefrom django.views.generic import Viewfrom django.db import transaction # 导入事务 # 类视图 (事务,@transaction.atomic装饰器)class MyView(View): @transaction.atomic # transaction.atomic装饰器可以保证该…

Undo the work performed by a series of steps, which together define an eventually consistent operation, if one or more of the steps fail. Operations that follow the eventual consistency model are commonly found in cloud-hosted applications that imple…

数据库事务处理# 你可以使用 transaction 方法,去执行一组数据库事务处理的操作: DB::transaction(function() { DB::table('users')->update(['votes' => 1]); DB::table('posts')->delete(); }); 注意: 在 transaction 闭包若抛出任何异常会导致事务自动回滚. 有时候你可能需要自己开始一个事务: DB::beginTransaction(); 你可以通过 rollba…

Overview of Oracle Database Transaction Isolation Levels Oracle 数据库提供如下事务隔离级别: 已提交读隔离级别 可串行化隔离级别 只读隔离级别 Read Committed Isolation Level 在(默认的)已提交读隔离级别中,事务中执行的每个查询,仅看到在查询开始之前提交的数据,而不是事务开始之前提交的数据.这一隔离级别适合于几乎不可能发生事务冲突的数据库环境 已提交读事务中的查询可以避免读取在查询过程中所提交的数据.例…

一.多表的创建 from django.db import models # Create your models here. class Author(models.Model): id = models.AutoField(primary_key=True) name = models.CharField(max_length=32) age = models.IntegerField() au = models.OneToOneField(to='AuthorDetail',to_fiel…

SYNOPSIS SET TRANSACTION [ ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE } ] [ READ WRITE | READ ONLY ] SET SESSION CHARACTERISTICS AS TRANSACTION [ ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE } ] [ READ WRITE | READ ONLY ] DESCRIPTION 描述 SET T…

SYNOPSIS START TRANSACTION [ ISOLATION LEVEL { READ COMMITTED | SERIALIZABLE } ] [ READ WRITE | READ ONLY ] DESCRIPTION 描述 这条命令开始一个新的事务.如果声明了隔离级别或者读写模式, 那么新事务就使用这个特性,如同执行了 SET TRANSACTION [set_transaction(7)] 一样.在其它方面,这条命令的行为和 BEGIN [begin(7)] 命令一样.…